/* ====================================================================
 * Copyright (c) 2014 - 2017 The GmSSL Project.  All rights reserved.
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 * modification, are permitted provided that the following conditions
 * are met:
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 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
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 *    distribution.
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 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the GmSSL Project.
 *    (http://gmssl.org/)"
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 * 4. The name "GmSSL Project" must not be used to endorse or promote
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 *    guanzhi1980@gmail.com.
 *
 * 5. Products derived from this software may not be called "GmSSL"
 *    nor may "GmSSL" appear in their names without prior written
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 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the GmSSL Project
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 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * ====================================================================
 */

#ifndef HEADER_SM3_H
#define HEADER_SM3_H

#define SM3_DIGEST_LENGTH 32  // 哈希值长度
#define SM3_BLOCK_SIZE    64  // 分组长度
#define SM3_CBLOCK        (SM3_BLOCK_SIZE)
#define SM3_HMAC_SIZE     (SM3_DIGEST_LENGTH)

#include <stdint.h>
#include <string.h>
#include <sys/types.h>

#ifdef __cplusplus
extern "C" {
#endif
typedef struct {
    uint32_t      digest[8];
    uint64_t      nblocks;
    unsigned char block[64];
    int           num;
} sm3_ctx_t;

typedef sm3_ctx_t sm3_ctx;

#define SM3_DATA_LEN (32)

void sm3_init(sm3_ctx_t* ctx);

void sm3_update(sm3_ctx_t* ctx, const unsigned char* data, size_t data_len);

void sm3_final(sm3_ctx_t* ctx, unsigned char digest[SM3_DIGEST_LENGTH]);

void sm3_compress(uint32_t            digest[8],
                  const unsigned char block[SM3_BLOCK_SIZE]);

void sm3(const unsigned char* data, size_t datalen,
         unsigned char digest[SM3_DIGEST_LENGTH]);

int sm3_sm2_init(sm3_ctx_t* ctx, const char* id, const unsigned char x[32],
                 const unsigned char y[32]);

void sm3_compute_id_digest(unsigned char z[32], const char* id,
                           const unsigned char x[32],
                           const unsigned char y[32]);

typedef struct {
    sm3_ctx_t     sm3_ctx;
    unsigned char key[SM3_BLOCK_SIZE];
} sm3_hmac_ctx_t;

void sm3_hmac_init(sm3_hmac_ctx_t* ctx, const unsigned char* key,
                   size_t key_len);

void sm3_hmac_update(sm3_hmac_ctx_t* ctx, const unsigned char* data,
                     size_t data_len);

void sm3_hmac_final(sm3_hmac_ctx_t* ctx, unsigned char mac[SM3_HMAC_SIZE]);

void sm3_hmac(const unsigned char* data, size_t data_len,
              const unsigned char* key, size_t key_len,
              unsigned char mac[SM3_HMAC_SIZE]);

#ifdef __cplusplus
}
#endif  // __cplusplus

#endif  // HEADER_SM3_H
